Woodward A9904-060 | Governor | Controller | Potential Converter
1.A9904-060 Product Overview
The Woodward A9904-060 belongs to the 505/505E series digital turbine controllers. It is a microprocessor-based control module designed for single-valve steam turbines,
including single extraction/admission systems or split-range actuator configurations.
The controller features a front panel Operator Control Panel (OCP) with a two-line, 24-character display and multi-function keypad, allowing easy on-site configuration and monitoring.
2. A9904-060 Technical Specifications and Parameters
| Parameter | Details |
|---|---|
| Power Supply | +24 VDC, approx. 1 A |
| I/O Outputs | Discrete Outputs: 8 Analog Outputs: 6 Actuator Outputs: 2 |
| Display / HMI | Two-line, 24-character LCD, with multi-function keypad |
| Dimensions | Approx. 14 × 11 × 4 in (35.6 × 27.9 × 10.2 cm) |
| Weight | Approx. 9.11 lbs (4.13 kg) |
| Operating Temperature | –4 to +140 °F (–20 to +60 °C) |
| Storage Temperature | –40 to +185 °F (–40 to +85 °C) |
| Humidity Standard | 95% RH at 20-55 °C for 48 hours without damage |
| Protection Class | Typically meets industrial dust and water protection standards |
| Communication Protocol | Supports Modbus, RS-232 / RS-422 serial interfaces |
3. Brand History
Woodward, Inc., founded in 1870 and headquartered in Fort Collins, Colorado, USA, is a global leader in energy control systems. The company has a long history of innovation in turbine control, engine management,
and power generation systems.
Woodward products are widely recognized for their reliability and precision in demanding industrial and power generation applications.
4. Applications in Industrial Automation
The A9904-060 plays a critical role in industrial automation and power generation environments:
- Steam Turbine Control: Manages startup, speed regulation, and extraction/admission control of steam turbines.
- Power Generation Systems: Used in power plants to regulate turbine-driven generators for stable frequency and load management.
- Compressor and Pump Drive Control: Ensures precise speed control for turbine-driven compressors and pumps.
- Process Industry Applications: Applied in chemical plants, refineries, and other industries requiring precise turbine operation.
- Safety and Protection Functions: Includes overspeed protection, critical speed avoidance, actuator travel limits, and event logging for operational safety.
Analysis of the working principle of servo drives and considerations for selecting servo drives
Servo drive is an indispensable component in modern industrial automation, mainly used to control the operation of servo motors.
Its core function is to convert input control signals (such as voltage and current signals) into mechanical motion of the motor.
The following is an introduction to the basic working principle of servo drives:
Input signal processing: The servo drive receives command signals from the control system, which may be analog
signals (such as voltage or current) or digital signals (such as pulse sequences).
Signal conversion: The control circuit inside the driver converts these signals into control signals that the motor
can understand, such as PWM (Pulse Width Modulation) signals.
Current control: The servo driver controls the speed and torque of the motor by adjusting the current output to the
motor. This is usually achieved through internal power transistors.
Speed and position feedback: Servo motors are usually equipped with encoders to provide actual speed and position
feedback of the motor. These feedback signals are sent back to the driver for comparison with the expected position or velocity.
Closed loop control: Based on feedback signals, the internal control algorithm of the driver (such as PID controller) will
adjust the output signal to reduce the deviation between actual and expected, achieving precise control.
Protection function: The servo drive also has overload, overheating, overvoltage and other protection functions to ensure
the safe operation of the motor and drive.
Click to learn more about Woodward”s products
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